In the future

the extraterrestrial human activities

such as resources exploitation and base construction beyond earth need the aid of geotechnical engineering technology. Currently

there are only two approaches for humans to obtain the rock samples beyond earth: sample-return activities by spacecraft and meteorite survey. Meteorites are rare

expensive

small in size and arbitrary in shape

so it is difficult to process them into standard rock samples required by mechanical testing & simulation (MTS) and other traditional macroscopic rock mechanical tests. In this paper

a novel technique for measuring mechanical property of small-size meteorites is developed based on microscopic rock mechanics experiments (micro-RME) and statistical probability models. Firstly

the composition

content and distribution of NWA13618 meteorite rock-forming minerals were obtained by TESCAN integrated mineral analyzer(TIMA). Then

the nanoindentation technology was used to carry out a large number of indentation tests to obtain the multi-point elastic modulus. After that

the mechanical parameters of four main minerals in meteorite NWA13618 were derived by using Gaussian mixture model

and the elastic moduli of olivine

pyroxene

Fe-Ni and feldspar were 116.73

101.77

87.24 GPa and 70.74 GPa

respectively. Finally

the macroscopic cm-scale elastic modulus of NWA13618 meteorite determined by the homogenization method Mori-Tanaka model was 90.48 GPa according to the mineral content and mechanical properties. The novel micro-rock mechanical experiment technique and scale upgrading method proposed in this paper provide theoretical basis and technical means for predicting the mechanical properties of L4 parent asteroid.