Drivers＇　workload　is　measured　at　sites　with　promise　on　National　Highway　109　Ning　Xia　HUI　autonomous　region　section　through　eye　tracking,　heart　rate　(HR),　breath　and　skin　resistance　(SR)　from　the　driver＇s　psycho-physical　aspect.　The　main　purpose　is　to　quantitatively　analyze　and　compare　the　workload　between　ordinary　segment　(on　straight　line　segment)　and　at　sites　with　promise　(on　high　radius　curve　and　urbanized　intersection),　and　then　to　evaluate　the　effect　of　safety　improvement　and　give　efficient　suggestions　from　human　factors　aspect.　Results　have　shown　that　workload　at　sites　with　promise　is　much　greater　than　that　at　ordinary　segment,　but　effect　of　the　safety　improvement　on　curve　using　signs　and　markings　is　far　from　expectation,　Some　corresponding　measures　are　also　put　forward　to　improve　safety　from　combination　of　engineering　and　ergonomics.