A measurement method, a terminal and a network side device are provided. The measurement method performed by a terminal includes: in a non-connected state, triggering an automatic measurement when a predetermined condition is met. In an embodiment of present disclosure, it is agreed that the terminal in a non-connected state triggers the automatic measurement when the predetermined condition has been met, so the terminal immediately reports an indication indicating that there is an available measurement result, or report an available measurement result, to the network side device when entering a connected state.