Urban　forests　by　the　riverside　are　important　habitats　for　various　animals　and　contribute　various　soundscapes　for　citizens.　Unfortunately,　urban　forests　are　exposed　to　the　influence　of　riverside　traffic　noises　from　freeways.　This　study　aims　to　explore　the　spatial　and　temporal　variation　of　soundscape,　conduct　soundscape　optimization　for　multiple　parameters,　and　find　a　balance　and　its　interval　of　soundscape　elements　through　optimizing　a　soundscape　map.　Questionnaires　and　measuring　equipment　were　used　to　gather　soundscape　information　in　an　urban　forested　area　in　Fuzhou,　China.　Diurnal　variations　and　soundscape　mapping　were　used　to　analyze　spatial　and　psychophysical　relationships　between　soundscape　drivers.　We　then　conducted　optimization　for　a　soundscape　map,　which　included　normalization,　critical　value　determination,　target　interval　of　optimal　SPL　determination,　and　modification　of　SPL　and　mapping.　Our　findings　suggest　that　biological　activities　and　natural　phenomena　are　potential　drivers　for　diurnal　variation　of　soundscapes,　especially　tidal　phenomena　contributing　water　and　shipping　soundscapes.　Our　results　also　suggest　that　all　the　high　values　of　perceived　soundscapes　were　found　at　the　southwest　corner　of　the　study　area,　which　includes　both　riverside　and　urban　forest　elements.　Furthermore,　we　suggest　combining　both　optimal　soundscape　and　SPL　correction　maps　to　aid　in　sustainable　design　in　urban　forests.　This　can　contribute　to　the　understanding　and　methodology　of　soundscape　map　optimization　in　urban　forests　when　proposing　suitable　design　plans　and　conservation　of　territorial　sound.　©　2023　by　the　authors.