Using the domestic pyrheliometer, Finland Milos500 bimetallic sunshine and domestic darktube sunshine recorders at Zhengzhou Meteorological Station and statistical analysis method, the sunshine and observation data from two sets of instruments are compared and analyzed. and the possible causes of the difference are discussed. Results show that the average sunshine duration difference between darktube and Milos500 bimetallic sunshine recorders is 1.6 hours, and that of domestic pyrheliometer and Milos500 bimetallic sunshine recorder is 2.1 hours. Milos500 Bimetallic sunshine recorder observations are much smaller than those of the darktube sunshine recorder and domestic pyrheliometer data, with the difference passing 95% significant level of ttest. The mean value of the difference of sunshine duration observed by the darktube sunshine recorder and the domestic pyrheliometer is 0.2 hours, which is not significant with the best correlation.