In order to improve the weather resistance and compatibility of acrylic modifiedpolysiloxane coatings，the effect of the structure and dosage of UV additives，the volume concentration of pigment（PVC）and the amount of titanium dioxide on the weather resistance of the coating were studied by evaluating the loss rate of gloss，chromatic aberration and pulverization. And also the structure and composition of the curing agent as well as the coatinginterval on the compatibility of the coating system were discussed through the evaluation ofinterlayer adhesion strength. Then，the optimal structure and dosage as well as combination of UV auxiliaries，the optimum PVC，the most suitable dosage of titanium dioxide and the mostappropriate curing agent of intermediate paint were determined. The results showed that theacrylic modified polysiloxane coatings had excellent weather resistance when BTZ and A-HALS composite UV-auxiliary was used with the dosage of 1. 8%-2. 4%，the PVC was not more than 0. 18 and the dosage of titanium dioxide was improved；the coating system hadexcellent compatibility when the curing agent of intermediate paint was cashew nut shell oilmodified amine or polyamide without small molecules and the compatibility could be improvedwhen the coating interval was properly extended.