A system for tissue density analysis, comprising: an acquisition module configured to obtain image data and tissue density distribution data of a target tissue, wherein the tissue density distribution data includes CT values based on the image data; a display module configured to: display the image data; and display the tissue density distribution data in a plurality of charts including density segmentations, wherein the plurality of charts include a CT value bar chart, a histogram, and a table, the histogram representing a volume distribution of regions having different CT values in the target tissue, and the table representing volumes and volume percentages of the density segmentations; and a processing module configured to: process, based on at least one of an annotation, a click, a double-click, or a voice input, the tissue density distribution data displayed in the plurality of charts by adjusting at least part of the density segmentations, including: adjusting a division of the density segmentations by adjusting one or more sliders in the CT value bar chart; and adjusting the density segmentations in the histogram and/or the table according to an adjustment result of the density segmentations of the CT value bar chart, wherein the volumes and the volume percentages in the table are redetermined based on the adjusted density segmentations; and adjust the image data based on the adjustment result of the at least part of the density segmentations; wherein the display module is further configured to display the adjusted image data and the processed tissue density distribution data. an acquisition module configured to obtain image data and tissue density distribution data of a target tissue, wherein the tissue density distribution data includes CT values based on the image data; a display module configured to: display the image data; and display the tissue density distribution data in a plurality of charts including density segmentations, wherein the plurality of charts include a CT value bar chart, a histogram, and a table, the histogram representing a volume distribution of regions having different CT values in the target tissue, and the table representing volumes and volume percentages of the density segmentations; and display the image data; and display the tissue density distribution data in a plurality of charts including density segmentations, wherein the plurality of charts include a CT value bar chart, a histogram, and a table, the histogram representing a volume distribution of regions having different CT values in the target tissue, and the table representing volumes and volume percentages of the density segmentations; and a processing module configured to: process, based on at least one of an annotation, a click, a double-click, or a voice input, the tissue density distribution data displayed in the plurality of charts by adjusting at least part of the density segmentations, including: adjusting a division of the density segmentations by adjusting one or more sliders in the CT value bar chart; and adjusting the density segmentations in the histogram and/or the table according to an adjustment result of the density segmentations of the CT value bar chart, wherein the volumes and the volume percentages in the table are redetermined based on the adjusted density segmentations; and adjust the image data based on the adjustment result of the at least part of the density segmentations; process, based on at least one of an annotation, a click, a double-click, or a voice input, the tissue density distribution data displayed in the plurality of charts by adjusting at least part of the density segmentations, including: adjusting a division of the density segmentations by adjusting one or more sliders in the CT value bar chart; and adjusting the density segmentations in the histogram and/or the table according to an adjustment result of the density segmentations of the CT value bar chart, wherein the volumes and the volume percentages in the table are redetermined based on the adjusted density segmentations; and adjusting a division of the density segmentations by adjusting one or more sliders in the CT value bar chart; and adjusting the density segmentations in the histogram and/or the table according to an adjustment result of the density segmentations of the CT value bar chart, wherein the volumes and the volume percentages in the table are redetermined based on the adjusted density segmentations; and adjust the image data based on the adjustment result of the at least part of the density segmentations; wherein the display module is further configured to display the adjusted image data and the processed tissue density distribution data.