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Long time power source is one of the key challenges for the application of micro/nano sensors,things of internet,etc.Flexible nanogenerator,which can harvest mechanical energies from environment and convert them into electricity,provides a feasible power source.In this presentation,several recently developed nanogenerators and their applications will be reported.Firstly,we talk about a synthesis method of lead zirconate titanate(PZT)textiles in which nanowires are parallel with each other,and a procedure to make them into flexible and wearable nanogenerators.[1] The nanogenerator can generate 6 V output voltage and 45 nA output current,which are large enough to power a liquid crystal display(LCD)and a UV sensor.Secondly,we report a kind of two dimensional fiber-based nanogenerator and the method to increase its robustness greatly,which is beneficial to the wearable and portable energy generation.[2] Thirdly,we talk about a flexible nanogenerator with ultrahigh output voltage of 209 V and output current density of 23.5 μA/cm2,which are sufficiently powerful to instantaneously lighten a commercial light-emitting diode(LED)without the energy storage process.[3] Fourthly,a new magnetic force-driven contactless nanogenerator(CLNG),with no contact between nanogenerator and mechanical movement source,will be demonstrated.