The participation of loads with adjustment potential in spot market will bring huge economic and social benefits. The multiple dimension evaluation research of adjustable load participation in spot market is beneficial for promoting adjustable load participation in the spot market. Firstly, a value evaluation based on scenario simulation and clearing comparison is proposed. Secondly, a market clearing model for adjustable load participation in spot trading is given. Thirdly, the value evaluation indicators of security, flexibility, low carbon and economy are constructed from the perspectives of power grid safe operation, adjustment capability, low carbon emission reduction and the revenue of market entities. Finally, two scenarios before and after the participation of adjustable load participation in the spot market are simulated using an improved IEEE 30-node system, and the results verified the effectiveness of the proposed evaluation indicators and methods.