As an important renewable bioresource, it is extremely important to find an efficient utilization approach for microalgae. During the main utilization method of pyrolysis process, a large number of high value-added products are wasted. In this article, extract-pyrolysis cascading utilization technical scheme was proposed and explored. The extract characteristic of microalgae using different solvents under mild condition were investigated. The selected solvents include conventional organic solvents and green solvent ionic liquids (ILs).The organic solvents were ethyl alcohol (EA), tetrahydrofuran (THF), pyridine (Py) and ILs were 3-dimethylamine propylamine formate (DMAPAF), diethylamine formate (DEAF), triethylamine formate (TEAF). ILs obtained higher extraction yields and wider varieties of compounds than organic solvents. Among them, TEAF possessed highest extraction yield of 22.97 % and oxygen-containing compounds account for 47.24 % of the extracts. The cross-linking bonds between the macromolecular structures of chlorella were destroyed after extraction. The product distribution of the subsequent pyrolysis process changed significantly. Compared with RAWC, the relative content of aromatic compounds and phenols in pyrolysis bio-oil increased, while the relative content of aliphatic compounds and nitrogen-containing compounds decreased. The total liquid yields increased through extract-pyrolysis cascading utilization, with the highest value of 58.51 % for TEAF.