Abstract: Based on the photo-thermal reactions of Myrica rubra，experimental data from different sites，years and varieties were used to develop a simulation model for development of Myrica rubra. Then the model was validated by independent experimental data. The results showed that the root mean squared error（RMSE）between simulated and observed days needed for reaching the development stage of female inflorescence emergence，female inflorescence flowering，leaf extending，fruit-setting and fruit ripening，respectively，were 2.51，1.83，2.68，2.70 and 2.45 days. Compared with the growth degree days（GDD）based model（RMSE was 8.02，7.81，5.46，5.40 and 11.83 days）and the PAR integral base model（RMSE was 8.28，11.0，8.52，5.56，6.87 days），the photo-thermal effectiveness based model developed in this study increased the simulation accuracy by 8.6% and 10.2%，respectively.

Key words: Myrica rubra, photo-thermal effectiveness, development, model