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%plot your figure before

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% figure resize
set(gcf,'Position',[100 100 260 220]);
set(gca,'Position',[.13 .17 .80 .74]);
figure_FontSize=8;
set(get(gca,'XLabel'),'FontSize',figure_FontSize,'Vertical','top');
set(get(gca,'YLabel'),'FontSize',figure_FontSize,'Vertical','middle');
set(findobj('FontSize',10),'FontSize',figure_FontSize);
set(findobj(get(gca,'Children'),'LineWidth',0.5),'LineWidth',2);

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解释：

set(gcf,'Position',[100 100 260 220]);
这句是设置绘图的大小，不需要到word里再调整大小。参数，图的大小是7cm

set(gca,'Position',[.13 .17 .80 .74]);
这句是设置xy轴在图片中占的比例，可能需要自己微调。

figure_FontSize=8;
set(get(gca,'XLabel'),'FontSize',figure_FontSize,'Vertical','top');
set(get(gca,'YLabel'),'FontSize',figure_FontSize,'Vertical','middle');
set(findobj('FontSize',10),'FontSize',figure_FontSize);

这4句是将字体大小改为8号字，在小图里很清晰

set(findobj(get(gca,'Children'),'LineWidth',0.5),'LineWidth',2);

这句是将线宽改为2