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Pulse position modulation (PPM) is a key technology for deep space optical communication (DSOC) system to improve the data transmission rate. To reach optimum rate, the modulation parameters of PPM are required to be analyzed. The rate can be improved by choosing appropriate modulation orders and the initial pulse width. In this paper, the meteorological statistical data of our experimental location are analyzed. Then, the analysis formula of the cloud scattering and atmospheric turbulence influence on PPM communication rate are given. The cloud particles are measured through aircraft detector, simulation analysis is carried out by using the measured data of aircraft detector. Finally, the influence on the communication rate of different cloud physical thickness are analyzed.