This article mainly describe the whole design of vacuum chamber connected to the QuanX model ED-XRF and the quantitative analysis method to the samples with curve surface, which are two major difficulties in the project of non-destructive analysis on intact porcelain vessel. The first change in the equipment is out of our own design, but completed in the factory of TN Spectrace Company, which can guarantee the analysis of porcelain vessel with any dimension in air condition. The varied instrument is regarded as a standard new type product due to the reasonable design; it is still far from ideal analysis with elements Na and Mg unable to be detected. The design of the vacuum chamber was based on volume consideration; it is better to find the balance between analysis requirement and cost together with technical difficulty. It should be noticed that the cost will soar at the chamber volume of about 40cm x 40cm x 40cm, because the vacuum chamber has to be established in new structure to ensure the safety at that volume, furthermore some other technical problem may also emerge due to the big volume. On the other hand, a statistic on volume distribution was made to be sure that more than 90 percent porcelain vessels have the volume less than 40cm x 30cm x 35cm quantitatively. Thus a chamber with 40cm x 30cm x 37cm volume is designed for non-destructive analysis. The big vacuum chamber can just make it possible to perform non-destructive analysis on intact porcelain vessel, some assistant gadgets are also designed to make the analysis convenient, such as: a camera is fixed to watch the analyzed sample surface; a shank can draw the sample frame within 10cm range, thus offer the possibility of linear scanning analysis for some special samples; a watching window not only offer observation of sample but also guarantee the safety of putting sample vessel into the chamber. XRF techniques are usually used for the manufacture in industry, there in nearly no sample with curve surface in those analyses, thus the quantitative analysis on the sample with curve surface was ignored before. With the development of scientific researches on ancient ceramics, some methods were proposed to give quantitative analysis on samples with curve surface, but limited quantitative effect can be got. By careful examining the formula of XRF calculation, it is found that the content Ci calculated from intensity may greatly differ from the content Ci’ gained from the convergence formula due to curve surface, so that the fundamental parameter method can hardly be applied to those sample with curve surface. If the factor A used in Ci calculation formula is replaced by A’ varying with convergence condition, the further calculation can be easily processed. If EC method is employed in calculation, a new spectra process is proposed to complete the quantitative analysis on the sample with curve surface. Since the total content of Al and Si can be usually more than 90% in most samples, there are almost equal peak area counts in different ancient porcelain samples. The spectra of ancient porcelains with curve surface can be normalized to the spectra with normal surface, the intensity obtained from the normalized spectra are used to get the analysis results. To achieve better quantitative results, it should be normalized to 100%. With both methods, rather satisfied results were obtained on the sample with curve surface. By enlarging the volume of vacuum chamber, adding some assistant accessories, improving the quantitative analysis on porcelain sample with curve sample, a set of new measuring system is established. The intact ancient porcelain vessels can be totally non-destructively analyzed in relatively low vacuum, which is proved by hundreds of analyses on various kinds of ancient porcelain vessels.