In this paper, a new hydraulic pump was presented, called KZB pump which has obtained the national patent of invention (patent number: 85103289.3). Originally comes from CY series pumps that are common used at present, KZB pump shows many advantages, such as high pressure, high efficiency, and long service life etc. This paper focuses on the rotational speed and noise level analysis of this new pump. Firstly, we described the configuration of both semi-open and full-open axial piston pumps in detail, which both of them were all new pumps and the later was also called KZB pump. Next, we investigated the distribution oil window size that influences the pump's rotational speed and noise level mostly by mathematical analysis. Finally, the analysis and comparisons of the rotational speed and noise level performances for the three type pumps which mentioned above were made. It is proved through the test that under the same working conditions KZB pump has made great advanced in controlling noise and having lower self-absorption rotational speed compared with the other type pumps.