A file uploading method in cloud storage, wherein the file uploading method comprises: extracting an eigenvalue of a target file to be uploaded; submitting an upload request comprising the eigenvalue to an application server, so that the application server determines, according to the upload request, whether a client needs to upload the target file; receiving an execution instruction that is sent, according to a determining result, by the application server; and if the execution instruction is an upload instruction, uploading the target file to a file server according to the upload instruction, wherein the eigenvalue comprises one or more of a size, a type, and a name of the target file for the application server to determine whether the target file meets user upload permission, or preliminarily determine whether the target file is the same as an existing file that has been saved by the file server; and wherein the file uploading method further comprises: if the execution instruction is a verification instruction, calculating a verification check value of the target file according to the verification instruction; and submitting the verification check value to the file server, so that the file server finally determines, according to the verification check value, whether the target file is the same as the existing file that has been saved by the file server, and feeds back a final determining result to the application server. extracting an eigenvalue of a target file to be uploaded; submitting an upload request comprising the eigenvalue to an application server, so that the application server determines, according to the upload request, whether a client needs to upload the target file; receiving an execution instruction that is sent, according to a determining result, by the application server; and if the execution instruction is an upload instruction, uploading the target file to a file server according to the upload instruction, wherein the eigenvalue comprises one or more of a size, a type, and a name of the target file for the application server to determine whether the target file meets user upload permission, or preliminarily determine whether the target file is the same as an existing file that has been saved by the file server; and wherein the file uploading method further comprises: if the execution instruction is a verification instruction, calculating a verification check value of the target file according to the verification instruction; and submitting the verification check value to the file server, so that the file server finally determines, according to the verification check value, whether the target file is the same as the existing file that has been saved by the file server, and feeds back a final determining result to the application server. if the execution instruction is a verification instruction, calculating a verification check value of the target file according to the verification instruction; and submitting the verification check value to the file server, so that the file server finally determines, according to the verification check value, whether the target file is the same as the existing file that has been saved by the file server, and feeds back a final determining result to the application server.