Abstract: To explore the problem of additional shrinkage cracking caused by long water vapor balance of large specimens, a new in-situ micromechanical test method was proposed to study the micro creep and shrinkage of cement paste. Combined with digital image correlation observation, uniaxial-biaxial compression creep and shrinkage tests were carried out on thin cement blocks in environmental scanning electron microscope and climate chamber . The test results show that compared with the traditional test method, the new test framework significantly shortens the drying time by at least 200 times, thus effectively reducing the risk of cracking. There is a high linear correlation between the free drying shrinkage of cement paste and the mass loss when the relative humidity is higher than 60 %. In the relative humidity of 50 % -60 %, the cavitation of water influences the drying shrinkage. Compared with the ambient air-drying conditions in the climate chamber, the drying conditions in the environmental scanning electron microscope have lower air pressure, which causes forced convection flow and leads to a significant increase in the drying rate. However, under the equilibrium state of relative humidity of 20 % RH, the shrinkage deformation of the two is basically the same. The rapid drying specimens have larger pores than the slow drying specimens, and the pores of the unloaded specimens are larger than those of the loaded specimens. In the uniaxial compression test, the change of drying creep with drying shrinkage shows a bilinear trend. In the biaxial compression test, the drying creep shows a linear relationship. The Poisson 's ratio of drying creep is negative in both compression tests. When the Poisson 's ratio is between-0.1 and 0, the creep properties obtained by CC test are basically consistent with the results of ESEM method.