Simulations of free electron laser (FEL) experiments based on the laser-wakefield accelerator, which will be conducted at Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Acadomy of Sciences, are performed. Direct-seeding with high harmonic generation (HHG) is proposed as the scheme for free-electron laser experiments at SIOM (SIOM-FEL). The theoretical and simulation results show that the FEL signal will be amplified about 200 times compared with the initial high harmonic generation when the electron beam energy spread is 1%, the emittance is 0.3 mm·mrad and the peak current is about 10 kA. What′s more, the application of the transverse gradient undulator (TGU) can furtuer improve the FEL performance even with a relatively low peak current.