Abstract: In order to study the change laws of inside temperature in solar greenhouse, the micro-climate observation test was done in Laiwu city in Shandong Province. The change laws under different weather condition every month has been carried out detailed analysis, the result has indicated that the minimum inside air temperature in December, January and February was below temperature that tomato grow to be at a standstill without exception, and appears on 8 o,clock, and the time was postponed one hour on cloudy day; The time was followed by 7 o,clock, 6 o,clock and 5 o,clock in March, April and May; and the minimum temperature in March , April , May was the highest during clear day, less during cloudy day, and the least during overcast day; The most significance on correlation between outside and inside air temperature occurred during overcast day, less during cloudy day, and the least during clear day, and the correlation has obvious difference day and night, the correlation of the day is less than at night. Inside warming effect has a great impact on winter.