用下面代码试一下, 应当可以
jts:=TJPEGImage.Create;
if table1.State<>dsedit then table1.edit;
jts.LoadFromFile('aaaa.jpg');
BlobStream:=TBlobStream.Create(TBlobField(FieldByName('zp')),bmWrite); //zp为long row类型
BlobStream.Position:=0;
jts.SaveToStream(BlobStream);
if Table1.State in [dsedit,dsInsert] then table1.post;