Abstract: Based on the observation data of temperature and sunshine hours during the growth period of the strawberry, the correlation between fresh weight, fruit shape index, fruit hardness and soluble solids content of strawberry and daily average temperature, daily average maximum temperature, average temperature difference between day and night, average daily minimum temperature, and sunshine hours was analyzed by partial least square regression analysis and linear regression analysis was carried out. The results showed that daily average temperature, daily average maximum temperature, average temperature difference between day and night, accumulated temperature and sunshine hours were important factors affecting strawberry fruit fresh weight, fruit shape index, fruit hardness and soluble solids content, and daily average minimum temperature was not an important factor. The daily average temperature, daily average maximum temperature and daily average temperature difference between day and night were negatively correlated with strawberry fruit fresh weight, fruit shape index, fruit hardness and soluble solids content. The relationship between sunshine hours and fruit fresh weight and fruit hardness was polynomial. Higher temperature and longer sunshine hours accelerated the growth rate of strawberry transverse meridians and reached the maximum earlier. The simulation effect was good when the partial least squares regression model was used to simulate the fresh weight, fruit shape index, fruit hardness and soluble solids content of strawberry fruit. The simulation result of fruit shape index was the best, and NRMSE was only 0.03%.

Key words: strawberry（Fragaria×ananassaDuch.）, fruit characteristics, air temperature, sunshine hours