A method for data transmission, comprising: determining a transmission link for data to be transmitted based on signal strengths of a mobile network and a Wireless-Fidelity, WIFI, network accessed by an unmanned aerial vehicle; and sending the data to be transmitted through the transmission link, characterized in that, determining the transmission link for the data to be transmitted based on the signal strengths of the mobile network and the WIFI network accessed by the unmanned aerial vehicle further comprises: in a case that a volume of the data to be transmitted is greater than a first volume threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or in a case that a volume of the data to be transmitted is not greater than a first volume threshold, comparing the signal strength of the mobile network with the signal strength of the WIFI network; in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determining a second link corresponding to the mobile network as the transmission link; or in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determining a first link corresponding to the WIFI network as the transmission link. determining a transmission link for data to be transmitted based on signal strengths of a mobile network and a Wireless-Fidelity, WIFI, network accessed by an unmanned aerial vehicle; and sending the data to be transmitted through the transmission link, characterized in that, determining the transmission link for the data to be transmitted based on the signal strengths of the mobile network and the WIFI network accessed by the unmanned aerial vehicle further comprises: in a case that a volume of the data to be transmitted is greater than a first volume threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or in a case that a volume of the data to be transmitted is not greater than a first volume threshold, comparing the signal strength of the mobile network with the signal strength of the WIFI network; in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determining a second link corresponding to the mobile network as the transmission link; or in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determining a first link corresponding to the WIFI network as the transmission link. in a case that a volume of the data to be transmitted is greater than a first volume threshold, determining a first link corresponding to the WIFI network and a second link corresponding to the mobile network as the transmission link; or in a case that a volume of the data to be transmitted is not greater than a first volume threshold, comparing the signal strength of the mobile network with the signal strength of the WIFI network; in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determining a second link corresponding to the mobile network as the transmission link; or in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determining a first link corresponding to the WIFI network as the transmission link. in a case that the signal strength of the mobile network is higher than or equal to the signal strength of the WIFI network, determining a second link corresponding to the mobile network as the transmission link; or in a case that the signal strength of the mobile network is lower than the signal strength of the WIFI network, determining a first link corresponding to the WIFI network as the transmission link.